Roof Drain Selector Guide Watts
Roof Drain Selector Guide Watts
Roof Drain Selector Guide Watts
TABLE OF CONTENTS
Pictorial Index
Product Recommendations
Roof Drain Selection Factors
Sizing
Placement
Material & Characteristics
Pipe Connection
Commonly Specified Options
Typical Installations
S-WD-RD-1 0812
Distributed by:
BEST MATERIALS LLC
Phoenix AZ
Ph: 800-474-7570, 602-272-8128
Fax: 602-272-8014
Email: sales@bestmaterials.com
www.bestmaterials.com
ROOF DRAINS
PICTORIAL INDEX
RD-100
Large Area
RD-100-SO
Side Outlet
RD-200-R
External Overflow
RD-240
Bottom Outlet Balcony
RD-100-CP
12" Promenade Top
RD-100-W
Internal Overflow
RD-200-SO
Side Outlet
RD-250
Overflow Combination
RD-100-F
Reversible Extension
Flange
RD-200
Small Area
RD-200-W
Internal Overflow
RD-260
Overflow Combination
RD-100-R
External Overflow
RD-200-CP
Promenade Top
RD-230
Side Outlet Balcony
RD-270
Scupper w/Angle Grate
S-WD-RD-2 0812
ROOF DRAINS
PICTORIAL INDEX
RD-280
General Purpose
RD-300-CP15
15"x15" Promenade Top
RD-400
Deck Receptor
RD-280-SO
Side Outlet
RD-300-F
Reversible Extension Flange
RD-410
Deck Receptor
RD-940
Downspout Nozzle
RD-290
Scupper w/Flat Grate
RD-300-R
External Overflow
RD-500
Super Max 12" Roof Drain
RD-950
Downspout Cover
RD-300
High Volume
RD-300-W
Internal Overflow
RD-680-VC
Vent Cap
RD-970/RD-980
Downspout Boots
S-WD-RD-3 0812
RD-900
Expansion Coupling
ROOF DRAINS
PRODUCT RECOMMENDATIONS
Application
Product
Balcony or Canopy
Deck Receptor
Downspout Nozzle / Cover
Downspout Boot
Primary Roof Area
Primary Roof Overow
Promenade or Patio
Scupper or Parapet
Secondary Roof Area
Secondary Roof Overow
RD-230, RD-240
RD-400, RD-410
RD-940, RD-950
RD-970, RD-980
RD-300, RD-300-F
RD-300-R, RD-300-W
RD-100-CP, RD-200-CP, RD-300-CP15
RD-270, RD-290
RD-100, RD-100-F, RD-200, RD-200-F
RD-100-R, RD-100-W, RD-200-R, RD-200-W
Sizing
1. Calculate roof area (sq. ft.) to be drained.
2"
2"
3"
3"
4"
4"
5"
1-1/2"
5"
6"
6"
4"
2"
7"
3"
1-1/2"
4"
3"
4"
5"
4"
4"
Chart A
5"
8"
6"
7"
8"
8"
8"
S-WD-RD-4 0812
7"
9"
ROOF DRAINS
ROOF DRAIN SELECTION FACTORS cont.
Rainfall
Rate
(inches/hour)
1
2
3
4
5
6
7
8
2,880
1,440
960
720
575
480
410
360
18,400
9,200
6,130
4,600
3,680
3,070
2,630
2,300
34,600
17,300
11,530
8,650
6,920
5,765
4,945
4,325
54,000
27,000
17,995
13,500
10,800
9,000
7,715
6,750
8
116,000
58,000
38,660
29,000
23,200
19,315
16,570
14,500
Maximum tributary areas which can be drained by Roof Drains, Vertical Rainwater Leaders, or
Storm-Water Conductors for Various Rainfall Rates. Source: ASPE Practical Plumbing Engineering (c) 1998
Chart B
Placement
For most efficient drainage, roof drains, to the extent possible, should be equally spaced. A roof drain must
also be located in any potential water collection area.
Pipe Connection
No Hub (Standard) - Butt connection using no hub or neoprene coupling, suitable for cast iron,
plastic, and most other piping applications.
Push-On (P) - Gasket connection ASTM C-564, with pipe stop. Suitable for no hub or service
weight cast iron, Sch. 40 plastic, and steel pipe. Recommended for below grade use only.
Threaded (T) - Female IPS thread in drain outlet.
Inside Caulk (X) - Caulk ring on drain outlet, pipe is inserted and joint sealed with lead & oakum.
PVC Socket (-60) - Sch. 40 PVC solvent weld female socket.
ABS Socket (-61) - Sch. 40 ABS solvent weld female socket.
Side Outlet (-SO) - No Hub (see above) side outlet.
S-WD-RD-5 0812
ROOF DRAINS
ROOF DRAIN SELECTION FACTORS cont.
S-WD-RD-6 0812
ROOF DRAINS
TYPICAL INSTALLATIONS
WATERPROOFING
WATERPROOFING
MEMBRANE
MEMBRANE
INSULATION
INSULATION
SUMP RECEIVER
RECEIVER
SUMP
METAL DECK
METAL
DECK
RD-100-B-D
UNDERDECK CLAMP
UNDERDECK
CLAMP
DOME
DOME
FLASHING CLAMP
FLASHING CLAMP
B15 BODY
B15 BODY
MEMBRANE
MEMBRANE
2" INSULATION
2" INSULATION
RD-300-D-F
METAL DECK
METAL DECK
UNDERDECK CLAMP
UNDERDECK CLAMP
WATERPROOFING
WATERPROOFING
MEMBRANE
MEMBRANE
CONCRETE
CONCRETE
UNDERDECK CLAMP
UNDERDECK
CLAMP
RD-100-D-W
S-WD-RD-7 0812
ROOF DRAINS
TYPICAL INSTALLATIONS
NICKEL BRONZE
HEEL-PROOF GRATE
PROM DECK
GROUT
WATERPROOFING
MEMBRANE
CONCRETE
UNDERDECK CLAMP
RD-300-CP-15
PIPE SIZE
PARAPET WALL
PARAPET WALL
FLASHING
FLASHING
CONCRETE
CONCRETE
RD-270
Distributed by:
BEST MATERIALS LLC
Phoenix AZ
Ph: 800-474-7570, 602-272-8128
Fax: 602-272-8014
Email: sales@bestmaterials.com
www.bestmaterials.com
S-WD-RD-8 0812